Administration of the MapR Database is done primarily via the command line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter
options. MapR Database administration is associated with tables, columns and column families, and table regions.

The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight
client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify
configuration settings, and how to administer and manage the service.

Setting a Hard Link

POSIX loopbacknfs client or NFS Gateway client, run the following command:

ln <sourcefile> <newfile>

where <sourcefile> is the
name of the file to link to and <newfile> is the name of the hard link, which must
not already be present.

Hadoop, run the following command:

hadoop mfs -lnh <sourcefile> <newfile>

where <sourcefile> is the
name of the file (including full path) to link to and <newfile> is the name of the
hard link (including the full path). When running this command, specify the full path to
both files.